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AM28F256 데이터시트(PDF) 6 Page - Advanced Micro Devices |
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AM28F256 데이터시트(HTML) 6 Page - Advanced Micro Devices |
6 / 35 page 6 Am28F256 PIN DESCRIPTION A0–A14 Address Inputs for memory locations. Internal latches hold addresses during write cycles. CE# (E#) Chip Enable active low input activates the chip’s control logic and input buffers. Chip Enable high will deselect the device and operates the chip in stand-by mode. DQ0–DQ7 Data Inputs during memor y write cycles. Internal latches hold data during write cycles. Data Outputs during memory read cycles. NC No Connect-corresponding pin is not connected internally to the die. OE# (G#) Output Enable active low input gates the outputs of the device through the data buffers dur ing memor y read cycles. Output Enable is high during command sequencing and program/erase operations. V CC Power supply for device operation. (5.0 V ± 5% or 10%) V PP Program voltage input. VPP must be at high voltage in order to write to the command register. The command register controls all functions required to alter the memory array contents. Memory contents cannot be altered when VPP ≤ VCC +2 V. V SS Ground WE# (W#) Write Enable active low input controls the write function of the command register to the memory array. The target address is latched on the falling edge of the Write Enable pulse and the appropriate data is latched on the rising edge of the pulse. Write Enable high inhibits writing to the device. |
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